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Issue 4, 2001
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A new 3-D polymeric spin transition compound: [tris(1,4-bis(tetrazol-1-yl)butane-N1,N 1′)iron(II)] bis(perchlorate)

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Abstract

A series of novel polymeric compounds of formula [M(btzb)3][ClO4]2 (MII = Fe, Ni or Cu) with btzb = 1,4-bis(tetrazol-1-yl)butane have been prepared and their physical properties investigated. The btzb ligand has been prepared and its crystal structure determined, together with a tentative crystal structure of the 3-D compound [Fe(btzb)3][ClO4]2. The model of the latter shows two symmetry-related, interpenetrating Fe–btzb networks in which the iron(II) ions approach each other as close as 8.3 and 9.1 Å. This supramolecular catenane undergoes a sharp thermal spin transition around 160 K with hysteresis (20 K) along with a pronounced thermochromic effect. The spin crossover behaviour has been followed by magnetic, DSC, optical spectroscopy and 57Fe Mössbauer spectroscopy measurements. Irradiation with green light at low temperature leads to population of the metastable high-spin state for the thermally active iron(II) ions. The nature of the spin crossover behaviour has been discussed in detail.

Graphical abstract: A new 3-D polymeric spin transition compound: [tris(1,4-bis(tetrazol-1-yl)butane-N1,N [ ] 1′)iron(II)] bis(perchlorate)

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Article information


Submitted
05 Oct 2000
Accepted
05 Dec 2000
First published
29 Jan 2001

J. Chem. Soc., Dalton Trans., 2001, 466-471
Article type
Paper

A new 3-D polymeric spin transition compound: [tris(1,4-bis(tetrazol-1-yl)butane-N1,N 1′)iron(II)] bis(perchlorate)

P. J. van Koningsbruggen, Y. Garcia, H. Kooijman, A. L. Spek, J. G. Haasnoot, O. Kahn, J. Linares, E. Codjovi and F. Varret, J. Chem. Soc., Dalton Trans., 2001, 466
DOI: 10.1039/B008073J

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